Samuel fraser



Patented lan; 3|, |899.-

S. FRASER.

STEAM BILER.

(Application led Apr. 8, 1898.;

(No Model.)

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SAMUEL FRASER, OF TORONTO, CANADA.

STEAM-BOILER.

SPECIFICATION formingpart of Letters Patent No. 618,501, dated January31, 1899.

d Application filed April 8, 1898- Serial No. 676,923. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL FRASER, of the city of Toronto, in the countyof York, in the Province of Ontario, Canada, have invented certain newand useful Improvements in Steam-Boilers, of whichthe following is aspecification.

My invention relates to improvements in steam-boilers and steam-boilerfurnaces; and the object of the invention is to improve the constructionof the boiler and furnace, whereby a maximum amount of heating-surfacemay be provided, and consequently the steam generated more quickly,arapid more complete circulation of water and consequent economy in fuel,and at the same time prevent the radiation of the heat from the walls ofthe furnace; and it consists, essentially, of a boiler having a furnacethe sides or walls of which are made of suitable metal tubes placed oneabove the other, the front of the tubes being connected to the boilerjust below the waterline and near the center line of the boiler and theback of the tubes being connected to the boiler near the bottom thereof,where the water is colder, the pipes and connections to the boiler beingotherwise arranged and constructed in detail as hereinafter moreparticularly explained.

Figure l is an elevation of a boiler constructed in-accordance with myinvention. Fig. 2 is a side elevation of Fig. l, partially in section.

In the drawings like letters of reference indicate corresponding partsin-each iigure.

In the drawings I have shown one-half of a double boiler, plus thecentral tubular partition.

A is the boiler proper,consisting of the usual flue-tubes a.

B is the furnace, which is provided with the usual front door b, frontb, bridge b2, and back b3, all lined with the usual lire-brick lining. n

o4 are the sides, which are provided with a lining b5 of asbestos orfire-clay to prevent radiation and to protect the outside plate from theintense heat of the furnace.

O are a series of tubes located on each side and forming, substantially,the wall of the furnace.

distance apart, one above the other. These The tubes C are located at aslight tubes are so spaced that there will be a clear space between themand the heat or iiames will entirely surround the tubes. The front plateb and bridge-plate b2 I provide with suitable holes for the pipes topass through. The ends of the tubes project through the plates b and b2,whereby the connections are not exposed to the intense heat of the fire.

Although in the drawings I only show the tubes extending j ust throughthe bridge-wall,

it will be understood that they may be carried to the full length of theboiler should it be deemed necessary.

The tubes are connected at the front end by the pipe-joints c to thestand-pipe D, which is closed at the bottom and is connected at the topto the boiler below the water-line, near the center line of the boiler.It will be noticed vthat the joints c are connected to the tubes O nearthe upper portion of the ends. The joints c' at the opposite end,however, are connected to the ends of the tubes G near the lower portionof the ends and are suitably connected to or form part of the stand-pipeE, which is connected by the pipe F to the branch pipe F', which extendsinto thebottom of the boiler.

vThe advantage of the connection of the joints c and c to the tubes O asdescribed is that the circulation is facilitated. The stand-pipe D isconnected, as hereinbefore described, to the center of the boiler, justbelow the waterline, in order to introduce the steam from the tubes Omost advantageously into the boiler, and the pipe F is connected to thelower portion of the boiler, where the water is colder than at or nearthe steam-line, thereby creating a free circulation of the water. I alsoprovide a drain-pipe Gr for the tubes. This construction can be adaptedto any multitubular boiler and increases the capacity of such p boiler`to a great extent.

The advantages of this class of boiler over ordinary boilers arenumerous. There are no walls to absorb the heat and afterward throw itoff into the boiler-room, but the heat is taken up by the tubes, which,being exposed IOO The advantages of this type over the locomotive typeof boiler are great. There are no flat surfaces. The tubes, beingcylindrical, take up the particles of heat more rapidly than verticalflat surfaces in the proportion of about tWo to one. Again, in the sameheight of {ire-box there is a greater amount of surface exposed toheat-in fact, nearly three times more, as the tubes are surrounded byheat. Again-Water-legs of the locomotive type of boiler frequently getchoked up with mud and becomea source of danger. Besides, the first costof these boilers is enormous in comparison with the plain cylindricaltype.

The boiler is simple and cheap and of great strength, and there isexcellent circulation and equal expansion and contraction and a greaterheating-surface than any boiler at present in use of which I am aware.

What I claim as my invention is- In a steam-boiler, the combination withthe main boiler proper and furnace-chamber, of

the horizontal side tubes forming the side Walls of the tire-box, thestand-pipes at each end of the tubes connected by suitable branches tothe ends of the tubes, the standpipe at the back of the boiler beinglocated in the furnace-chamber and the branches thereof connected to theside tubes at the lower portion of the ends of the tube and thestand-pipe at the front end of the boiler entirely outside the Wall andconnected to this end of the side tubes at the upper portion of theends, a suitable inlet-pipe connected to the rear end of the boiler nearthe bottom thereof and to the stand-pipe and a suitable branch orextension of the outer front stand-pipe extending into the boilerimmediately below the Water-line thereof, substantially as described.

SAMUEL FRASER.

l/Vitnesses:

B. BOYD, p A. H. MCADAM.

